package com.itheima.interceptor;

import com.alibaba.fastjson.JSONObject;
import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Slf4j
@Component
public class LoginCheckInterceptor implements HandlerInterceptor {

    @Override //目标资源方法运行前运行, 成功返回ture 失败返回false
    public boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object handler) throws Exception {

        //1、获取请求的url
        String url = req.getRequestURL().toString();
        log.info("请求的url:{}",url);
        //2、判断请求url中是否包含login 有-》说明是登录操作，直接放行
        if(url.contains("login")){
            log.info("登录操作，放行...");
            return true;
        }
        //3.获取请求头中的令牌(token)
        String jwt = req.getHeader("token");

        //4.判断令牌是否存在 如果不存在 返回错误结果(未登录)
        if(!StringUtils.hasLength(jwt)){
            log.info("请求头token为空, 未登录的信息");
            Result error = Result.error("NOT_LOGIN");
            //手动转换返回值的类型为json格式的数据  借助阿里巴巴的fastJSON
            String notlogin = JSONObject.toJSONString(error);
            resp.getWriter().write(notlogin);
            return false;
        }
        //5.解析令牌 如果解析失败，返回错误结果(未登录)
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) {
            //jwt解析失败
            e.printStackTrace();
            log.info("解析令牌失败,返回未登录的信息");
            Result error = Result.error("NOT_LOGIN");
            //手动转换返回值的类型为json格式的数据  借助阿里巴巴的fastJSON
            String notlogin = JSONObject.toJSONString(error);
            resp.getWriter().write(notlogin);
            return false;
        }
        //放行
        log.info("令牌合法！");

        return true;
    }

    @Override   //目标资源方法运行后运行
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle……");
    }

    @Override //最后运行 视图渲染完毕之后运行
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion");
    }
}
